If you don't want to use NSURLConnection directly (it's kind of a pain) there are a few Objective-C frameworks to choose from:

* [[https://github.com/TouchCode/trundle|Trundle]] is being used by a few apps already. * [[https://github.com/couchbaselabs/CouchCocoa|CouchCocoa]] is a newer framework, somewhat higher-level than Trundle. It's supported by Couchbase, but is free and open-source. * [[http://code.brautaset.org/CouchObjC/|CouchObjC]] is an older project that doesn't seem to be maintained anymore.

If you want to use CouchDB in an iOS app, with a local database, you'll likely want to use the [[https://github.com/couchbaselabs/iOS-Couchbase|Mobile Couchbase]] framework.